US5042108A - Suction pipe for a vacuum cleaner - Google Patents
Suction pipe for a vacuum cleaner Download PDFInfo
- Publication number
- US5042108A US5042108A US07/525,282 US52528290A US5042108A US 5042108 A US5042108 A US 5042108A US 52528290 A US52528290 A US 52528290A US 5042108 A US5042108 A US 5042108A
- Authority
- US
- United States
- Prior art keywords
- suction pipe
- sound
- cylindrical body
- ceiling portion
- absorbing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/24—Hoses or pipes; Hose or pipe couplings
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/24—Hoses or pipes; Hose or pipe couplings
- A47L9/248—Parts, details or accessories of hoses or pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/0336—Noise absorbers by means of sound-absorbing materials
Definitions
- the present invention relates to a suction pipe for a vacuum cleaner, and particularly relates to a suction pipe which has a sound-absorbing system.
- a conventional suction pipe with a sound-absorbing system which is designated by the reference numeral 2 in FIG. 10, is connected to a suction pipe 1 without a sound-absorbing system, so as to be used in the cleaning operation of a vacuum cleaner.
- FIGS. 11 and 12 show longitudinal and cross sectional views, respectively, of the suction pipe 2 with a sound-absorbing system.
- the suction pipe 2 includes an outer pipe 4 and an inner pipe 3, and also includes a sound-absorbing material 5 between the inner and outer pipes 3 and 4.
- the portion of the inner pipe 3 which is surrounded by the sound-absorbing material 5 is provided with holes 6. Noise which is caused by the sucked air and passing through the suction pipe 2 is directed through the holes 6 and absorbed by the sound-absorbing material 5.
- the suction pipe for a vacuum cleaner of this invention which overcomes the above-discussed and numerous other disadvantages and deficiencies of the prior art, comprises: a hollow cylindrical body having sound-absorbing holes on a ceiling portion thereof, said ceiling portion extending in the air-inducing direction; a cover attached to the outer surface of said cylindrical body to cover said ceiling portion; and a sound-absorbing material disposed between said cover and said ceiling portion.
- each of the sound-absorbing holes is tapered to allow its inner diameter to gradually become smaller toward the inside of the cylindrical body.
- the inner surface of the ceiling portion is covered with a net.
- the sound-absorbing material has matricidal and antibacterial properties.
- the invention described herein makes possible the objective of providing a suction pipe which has a small outer diameter so as to be easily handled, and also has excellent noise absorbing properties.
- FIG. 1 is a side elevation showing a pair of suction pipes of this invention, which are connected to the other suction members of a vacuum cleaner.
- FIG. 2 is an exploded perspective view of a first example of the suction pipe according to the invention.
- FIG. 3 is a cross-sectional view showing the suction pipe of FIG. 2.
- FIGS. 4a and 4b are graphs showing the results of noise-level tests performed on the suction pipe of FIG. 2.
- FIGS. 5a and tb are graphs showing the results of noise-level tests performed on a suction pipe without a sound-absorbing system.
- FIG. 6 is an exploded perspective view of a second example of the suction pipe according to the invention.
- FIG. 7 is a cross-sectional view showing the suction pipe of FIG. 6.
- FIGS. 8a and 8b are graphs showing the results of noise-level tests performed on the suction pipe of FIG. 6.
- FIGS. 9a and 9b are graphs showing the results of noise-level tests performed on a suction pipe without a sound-absorbing system.
- FIG. 10 is a side elevation showing a conventional suction pipe having a sound-absorbing system, which is connected to the other suction members of a vacuum cleaner.
- FIG. 11 is a longitudinal sectional view of the conventional suction pipe with the sound-absorbing system shown in FIG. 10.
- FIG. 12 is a cross-sectional view taken along the line X--X of FIG. 11.
- FIG. 1 shows suction members of a vacuum cleaner, including a pair of suction pipes of this invention connected to each other.
- a hose 11 When the vacuum cleaner is to be operated, a hose 11, two suction pipes 12 of this invention, and a connector 14 of a floor nozzle 13 are connected to each other in that order, and the other end of the hose 11 is connected to the body of the vacuum cleaner (not shown).
- the suction pipe 12 illustrated in FIGS. 2 and 3 comprises a hollow cylindrical body 16, a cover 17, and a sound-absorbing material 18 placed therebetween.
- the cylindrical body 16 has sound-absorbing holes 15 on a ceiling portion thereof, the ceiling portion extending in the direction in which air is induced into the body of the vacuum cleaner (this direction will be hereinafter referred to as "the air-inducing direction").
- a partition wall 19 protrudes from the outer surface of the cylindrical body 16 so as to surround the ceiling portion of the cylindrical body 16 which has the sound-absorbing holes 15.
- the cover 17 is attached to the cylindrical body 16 to cover the ceiling portion thereof; the inner surface of the cover 17 is welded to the top of the partition wall 19, and the side ends of the cover 17 are also welded to ribs 16a located outside the partition wall 19 and on the outer surface of the cylindrical body 16.
- the sound-absorbing material 18 is placed inside the partition wall 19 and between the cylindrical body 16 and the cover 17.
- One end of the cylindrical body 16 is provided with a hook 20, by which the suction pipe 12 is connected to another suction pipe or to the connector 14 of the floor nozzle 13, as shown in FIG. 1.
- Each of the sound-absorbing holes 15 is tapered so that its inner diameter becomes gradually smaller toward the inside of the cylindrical body 16. This configuration allows the sound-absorbing material 18 to readily enter the holes 15 and also prevents the particles of dust sucked into the suction pipe 12 from coming into the holes 15. Also with this configuration, the air absorbed by the sound-absorbing material 18 is prevented from flowing back into the inside of the cylindrical body 16.
- the sound-absorbing material 18 which is in the form of a plate and weighs 250 g to 500 g per square meter, has elasticity so that it vibrates due to the change in pressure when the power switch of the vacuum cleaner is turned off. This vibration causes fine particles such as those of sand and cement in the holes 15 to fall down to the inside of the cylindrical body 16, thereby preventing the holes 15 from becoming clogged.
- the sound-absorbing material 18 also has matricidal and antibacterial properties, thereby preventing the propagation of ticks, mites, germs, bacteria, and the like.
- the outer diameter of the suction pipe 12 can be made smaller, as compared with that of the conventional suction pipe.
- the suction pipe 12 of this example can be easily handled.
- the formation of the sound-absorbing holes 15 and the production of the cylindrical body 16 can be performed at the same time, and the welding of the cover 17 to the cylindrical body 16 can be performed also at this time.
- the process of producing the suction pipe can be simplified.
- FIGS. 4a and 4b show the results of the noise-level tests performed on the suction pipe 12 of this example, in accordance with the Test Procedures under the Japanese Industrial Standard.
- FIG. 4a shows the levels of noise measured at a position one meter above the suction pipe 12, with respect to different frequencies of the noise.
- FIG. 4b shows those measured at a position one meter away in the horizontal direction from one side of the suction pipe (i.e., one meter away from the right or left side in FIG. 3).
- a suction pipe with no sound-absorbing system was also tested under the same conditions, the results of which are shown in FIGS. 5a and 5b.
- the noise levels when measured at the position one meter above the suction pipe without a sound-absorbing system, the noise levels were 44 dB at the frequency of 1 KHz, 37 dB at 2 KHz, and 34 dB at 4 KHz.
- the noise levels when measured at the position one meter away in the horizontal direction from one side of the suction pipe without a sound-ceiling absorbing system, the noise levels were 45 dB at 1 KHz, 35 dB at 2 KHz, and 35 dB at 4 KHz.
- the noise levels of the suction pipe 12 of this example were 2 dB lower at 1 KHz, 2 dB lower at 2 KHz, and 3-5 dB lower at 4 KHz than the corresponding values obtained by the suction pipe without a sound-absorbing system shown in FIGS. 5a and 5b.
- the average level of all the values shown in FIGS. 4a and 4b is 1.3 dB lower than that of the values shown in FIGS. 5a and 5b. This means that the noise caused by the air sucked into the floor nozzle was reduced by the sound-absorbing system of the suction pipe 12.
- FIGS. 6 and 7 show another example of the suction pipe 12 according to the invention, which comprises a hollow cylindrical body 22, an inner cover 24 having sound-absorbing holes 23 on the bottom wall thereof, an outer cover 26, and a sound-absorbing material 27.
- the cylindrical body 22 is provided with an opening 21 in the ceiling portion thereof, the opening 21 extending in the air-inducing direction.
- the inner cover 24 is fit into the opening 21 so that the side wall of the cylindrical body 22 and the bottom wall of the inner cover 24 having the sound-absorbing holes 23 define a cylindrical shape.
- the outer cover 26 is attached to the cylindrical body 22 to cover the ceiling portion thereof; the inside of the outer cover 26 is welded to the top of the inner cover 24, and the side ends of the outer cover 26 are welded to ribs 25 located on the outer surface of the cylindrical body 22 and outside the inner cover 24.
- the sound-absorbing material 27 is placed between the inner cover 24 and the outer cover 26.
- the lower surface of the bottom wall of the inner cover 24 is covered with a net 28, which prevents dust particles from coming into the sound-absorbing holes 23.
- the net 28 and the inner cover 24 are integrally formed, thereby preventing the edge of the net 28 from fraying out or peeling off.
- One end of the cylindrical body 22 is provided with a hook 29, by which the suction pipe 12 is connected to another suction pipe or to the connector 14 of the floor nozzle 13, as shown in FIG. 1.
- each of the sound-absorbing holes 23 is tapered so that its inner diameter becomes gradually smaller toward the inside of the cylindrical body 22.
- This configuration allows the sound-absorbing material 27 to readily enter the holes 23 and also prevents the particles of dust sucked into the suction pipe 12 from coming into the holes 23. Also with this configuration, the air absorbed by the sound-absorbing material 27 is prevented from flowing back into the inside of the cylindrical body 22.
- the sound-absorbing material 27 which is in the form of a plate and weighs 250 g to 500 g per square meter, has elasticity so that it vibrates due to the change in pressure when the power switch of the vacuum cleaner is turned off. This vibration causes fine particles such as those of sand and cement in the holes 23 to fall down to the inside of the cylindrical body 22, thereby preventing the holes 23 from becoming clogged.
- the sound-absorbing material 27 also has matricidal and antibacterial properties, thereby preventing the propagation of ticks, mites, germs, bacteria, and the like.
- the sound-absorbing holes 23 and the sound-absorbing material 27 are provided only on the ceiling portion of the cylindrical body 22 of the suction pipe 12, so that the outer diameter of the suction pipe 12 is made smaller, as compared with that of the conventional suction pipe.
- the suction pipe 12 of this example can be easily handled.
- the noise levels when measured at the position one meter above the suction pipe without a sound-absorbing system, the noise levels were 42 dB at the frequency of 500 Hz, 45 dB at 1 KHz, 36 dB at 2 KHz, and 32 dB at 4KHz.
- the noise levels when measured at the position one meter away in the horizontal direction from one side of the suction pipe without a sound-absorbing system, the noise levels were 48 dB at 500 Hz, 47 dB at 1 KHz, 37 dB at 2 KHz, and 36 dB at 4 KHz.
- the noise levels of the suction pipe 12 of this example were 1 to 2 dB lower at 500 Hz, 2 dB lower at 1 KHz, 1 to 2 dB lower at 2 KHz, and 2 dB lower at 4 KHz, than the corresponding values obtained by the suction pipe without a sound-absorbing system shown in FIGS. 9a and 9b.
- the average level of all the values shown in FIGS. 8a and 8b is 1.9 dB lower than that of the values shown in FIGS. 9a and 9b. This means that the noise caused by the air sucked into the floor nozzle was reduced by the sound-absorbing system of the suction pipe 12.
- the outer diameter of the suction pipe can be made smaller and thus it can be easily handled. Furthermore, in the suction pipe of this invention, the dust particles are prevented from coming into the sound-absorbing holes due to the tapered configuration thereof, and as proved by the above noise-level tests for Examples 1 and 2, the noise caused by the sucked air can be sufficiently reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Suction Cleaners (AREA)
- Electric Vacuum Cleaner (AREA)
- Nozzles For Electric Vacuum Cleaners (AREA)
- Filters For Electric Vacuum Cleaners (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1130406A JPH02307418A (ja) | 1989-05-23 | 1989-05-23 | 真空掃除機用吸込みパイプ |
JP1-130406 | 1989-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US5042108A true US5042108A (en) | 1991-08-27 |
Family
ID=15033520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/525,282 Expired - Fee Related US5042108A (en) | 1989-05-23 | 1990-05-17 | Suction pipe for a vacuum cleaner |
Country Status (6)
Country | Link |
---|---|
US (1) | US5042108A (es) |
EP (1) | EP0399433B2 (es) |
JP (1) | JPH02307418A (es) |
KR (1) | KR920005910B1 (es) |
DE (1) | DE69010400T3 (es) |
ES (1) | ES2057263T5 (es) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6158082A (en) * | 1998-03-10 | 2000-12-12 | The Toro Company | Portable blower with blower tube noise reduction |
US6295691B1 (en) * | 2000-01-31 | 2001-10-02 | Chung Ming Chen | Vapor cleaning device |
US6680028B1 (en) | 1994-06-20 | 2004-01-20 | Clean Air Research & Engineering, Inc. | Portable air purifier apparatus and system |
US20070066208A1 (en) * | 2005-09-20 | 2007-03-22 | Valeo Systemes Thermiques S.A.S. | Enhanced acoustic heating, ventilation and/or air-conditioning unit |
CN100397483C (zh) * | 2003-03-17 | 2008-06-25 | 三菱电机株式会社 | 噪音降低装置 |
US20080263817A1 (en) * | 2005-09-23 | 2008-10-30 | Makarov Sergey V | Vacuum Cleaner with Ultraviolet Light Source and Ozone |
JP2015089432A (ja) * | 2013-11-06 | 2015-05-11 | 三菱電機株式会社 | 電気掃除機の消音構造 |
US11206961B2 (en) * | 2017-03-08 | 2021-12-28 | Kyocera Industrial Tools Corporation | Sound absorption structure for air flow path in electric air flow generation device and electric vacuum |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4418433C2 (de) * | 1993-05-29 | 1998-04-09 | Daewoo Electronics Co Ltd | Bürstenanordnung für einen Staubsauger mit einem schalldämpfenden System |
US5979013A (en) * | 1998-03-10 | 1999-11-09 | The Toro Company | Portable blower with noise reduction |
KR100345229B1 (ko) * | 2000-07-06 | 2002-07-25 | 삼성광주전자 주식회사 | 배기환류형 진공청소기 |
KR100767117B1 (ko) * | 2006-09-25 | 2007-10-17 | 삼성광주전자 주식회사 | 이동 설치가 가능한 소음저감장치를 구비한 진공청소기 |
IT1400167B1 (it) * | 2010-05-21 | 2013-05-17 | Fiat Group Automobiles Spa | Condotto silenziato per fluidi aeriformi e metodo per il suo ottenimento. |
JP6500209B2 (ja) * | 2013-08-20 | 2019-04-17 | パナソニックIpマネジメント株式会社 | 集塵装置 |
CN104545697B (zh) * | 2013-10-28 | 2017-06-06 | 江苏美的清洁电器股份有限公司 | 用于吸尘器的连接管组件和具有其的吸尘器 |
WO2016112996A1 (de) | 2015-01-13 | 2016-07-21 | Alfred Kärcher Gmbh & Co. Kg | Sauggerät und verfahren zum betreiben eines sauggeräts |
DE102015100426A1 (de) * | 2015-01-13 | 2016-07-14 | Alfred Kärcher Gmbh & Co. Kg | Reinigungsgerät und Verfahren zur Lärmminderung bei einem Reinigungsgerät |
RU2680950C2 (ru) * | 2015-01-13 | 2019-02-28 | Альфред Кэрхер Гмбх Унд Ко. Кг | Всасывающий аппарат |
DE102018108559A1 (de) * | 2018-04-11 | 2019-10-17 | Alfred Kärcher SE & Co. KG | Reinigungsgerät |
CN109199218B (zh) * | 2018-09-28 | 2021-06-25 | 江苏美的清洁电器股份有限公司 | 清洁设备和用于清洁设备的消音装置 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB455962A (en) * | 1935-03-26 | 1936-10-26 | Hoover Co | Improvements in or relating to suction cleaners |
US2125850A (en) * | 1937-02-27 | 1938-08-02 | Regina Corp | Vacuum cleaner muffler |
US2188428A (en) * | 1939-09-19 | 1940-01-30 | Maud E Evans | Auxiliary bag for vacuum cleaners |
FR853854A (fr) * | 1938-11-18 | 1940-03-30 | Ventil Atel | Silencieux pour canalisations de ventilation et autres |
US3308608A (en) * | 1960-01-28 | 1967-03-14 | Electrolux Ab | Vacuum cleaner |
US3511336A (en) * | 1969-06-10 | 1970-05-12 | Rink Corp | Sound attenuator for air flow |
FR2257850A1 (en) * | 1974-01-11 | 1975-08-08 | Strulik Wilhelm | Sound and thermally insulated duct system - has thermal insulating medium combined with perforated inner duct |
US4091892A (en) * | 1974-08-30 | 1978-05-30 | General Electric Company | Phased treatment noise suppressor for acoustic duct applications |
-
1989
- 1989-05-23 JP JP1130406A patent/JPH02307418A/ja active Pending
-
1990
- 1990-05-17 US US07/525,282 patent/US5042108A/en not_active Expired - Fee Related
- 1990-05-21 EP EP90109599A patent/EP0399433B2/en not_active Expired - Lifetime
- 1990-05-21 DE DE69010400T patent/DE69010400T3/de not_active Expired - Fee Related
- 1990-05-21 ES ES90109599T patent/ES2057263T5/es not_active Expired - Lifetime
- 1990-05-23 KR KR1019900007429A patent/KR920005910B1/ko not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB455962A (en) * | 1935-03-26 | 1936-10-26 | Hoover Co | Improvements in or relating to suction cleaners |
US2125850A (en) * | 1937-02-27 | 1938-08-02 | Regina Corp | Vacuum cleaner muffler |
FR853854A (fr) * | 1938-11-18 | 1940-03-30 | Ventil Atel | Silencieux pour canalisations de ventilation et autres |
US2188428A (en) * | 1939-09-19 | 1940-01-30 | Maud E Evans | Auxiliary bag for vacuum cleaners |
US3308608A (en) * | 1960-01-28 | 1967-03-14 | Electrolux Ab | Vacuum cleaner |
US3511336A (en) * | 1969-06-10 | 1970-05-12 | Rink Corp | Sound attenuator for air flow |
FR2257850A1 (en) * | 1974-01-11 | 1975-08-08 | Strulik Wilhelm | Sound and thermally insulated duct system - has thermal insulating medium combined with perforated inner duct |
US4091892A (en) * | 1974-08-30 | 1978-05-30 | General Electric Company | Phased treatment noise suppressor for acoustic duct applications |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6680028B1 (en) | 1994-06-20 | 2004-01-20 | Clean Air Research & Engineering, Inc. | Portable air purifier apparatus and system |
US6158082A (en) * | 1998-03-10 | 2000-12-12 | The Toro Company | Portable blower with blower tube noise reduction |
US6324720B1 (en) | 1998-03-10 | 2001-12-04 | The Toro Company | Portable blower tube noise reduction |
US6295691B1 (en) * | 2000-01-31 | 2001-10-02 | Chung Ming Chen | Vapor cleaning device |
CN100397483C (zh) * | 2003-03-17 | 2008-06-25 | 三菱电机株式会社 | 噪音降低装置 |
US20070066208A1 (en) * | 2005-09-20 | 2007-03-22 | Valeo Systemes Thermiques S.A.S. | Enhanced acoustic heating, ventilation and/or air-conditioning unit |
US20080263817A1 (en) * | 2005-09-23 | 2008-10-30 | Makarov Sergey V | Vacuum Cleaner with Ultraviolet Light Source and Ozone |
JP2015089432A (ja) * | 2013-11-06 | 2015-05-11 | 三菱電機株式会社 | 電気掃除機の消音構造 |
US11206961B2 (en) * | 2017-03-08 | 2021-12-28 | Kyocera Industrial Tools Corporation | Sound absorption structure for air flow path in electric air flow generation device and electric vacuum |
Also Published As
Publication number | Publication date |
---|---|
ES2057263T3 (es) | 1994-10-16 |
EP0399433B1 (en) | 1994-07-06 |
KR900017541A (ko) | 1990-12-19 |
DE69010400D1 (de) | 1994-08-11 |
EP0399433B2 (en) | 1998-03-11 |
ES2057263T5 (es) | 1998-05-01 |
DE69010400T2 (de) | 1995-02-02 |
KR920005910B1 (ko) | 1992-07-24 |
EP0399433A1 (en) | 1990-11-28 |
JPH02307418A (ja) | 1990-12-20 |
DE69010400T3 (de) | 1998-06-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:YAMAZUMI, SHUJI;KAWAKAMI, HIROSHI;REEL/FRAME:005339/0990 Effective date: 19900510 |
|
FEPP | Fee payment procedure |
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